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Fix nsync_mu_unlock_slow_() on Apple Silicon

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We torture test dlmalloc() in test/libc/stdio/memory_test.c. That test
was crashing on occasion on Apple M1 microprocessors when dlmalloc was
using *NSYNC locks. It was relatively easy to spot the cause, which is
this one particular compare and swap operation, which needed to change
to use sequentially-consistent ordering rather than an acquire barrier
This commit is contained in:
Justine Tunney 2023-11-13 10:57:02 -08:00
parent 3b15d31247
commit 751d20d98d
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5 changed files with 36 additions and 2 deletions
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2
third_party/nsync/README.cosmo vendored
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@ -15,6 +15,8 @@ ORIGIN
LOCAL CHANGES
- Fix nsync_mu_unlock() on Apple Silicon
- Time APIs were so good that they're now in libc
- Double linked list API was so good that it's now in libc